Abstract
WS2 has been considered as a promising anode material due to its high lithium storage capacity as well as fascinating physical properties. However, the insufficient electrical and ionic conductivities deteriorate the rate performance of the batteries. Herein, we report a simple synthetic approach towards graphene-WS2 hybrids by rolling graphene into a hollow nanotube in which WS2 nanoplates are encapsulated. This new electrode design strategy facilitates the fabrication of integrated and binder-free lithium ion battery and sodium ion battery electrodes by combining electrospinning and chemical vapor deposition (CVD) methods. Benefiting from their confined growth and the interconnected in-situ graphitic carbon coating nanocable web, the WS2@G with nano-level WS2 dispersion not only provides an efficiently conductive and electrolyte accessible framework, but effectively alleviates the volume change during the cycling, enabling a mechanically robust binder-free electrode along with the outstanding electrochemical Li+ and Na+ storage properties.
摘要
本论文通过结构设计及简单方法成功制备一种二维石墨烯-WS2复合结构, 即WS2纳米片嵌入石墨烯化中空纳米碳管中(WS2@G). 这种新的电极结构采用静电纺丝技术和化学气相沉积技术组合的方式, 有利于实现集成化和无粘结剂锂离子或钠离子电池电极材料制备. 采用内部的受限生长以及原位的石墨化碳包覆纳米同轴的互贯网络, 得到纳米尺度WS2片层分散的WS2@G复合结构, 能够提供有效的导电性和电解液浸润性的网络结构, 同时还能够有效地降低电池在充放电循环过程中导致的体积膨胀效应, 最终实现一种高机械性能、 无粘结剂、 优异电化学活性的电极在锂离子或钠离子电池储能领域中的应用.
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Acknowledgements
This work was supported by the Ministry of Science and Technology of China (2012CB933403), the National Natural Science Foundation of China (51425302, 51302045 and 5170021056), Beijing Municipal Science and Technology Commission (Z121100006812003), the Opening Project of State Key Laboratory of Advanced Technology for Float Glass, and the Chinese Academy of Sciences.
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Debin Kong received his BSc and PhD in applied chemistry from Tianjin University under the guidance of Prof. Linjie Zhi and Prof. Quan-Hong Yang. Now he continues his scientific research as an Assistant Professor in the National Center for Nanoscience and Technology. His research interests mainly focus on the design and fabrication of novel carbon nanostructure and novel electrode materials for energy conversion and storage.
Xiongying Qiu received his bachelor’s degree from the University of Chinese Academy of Sciences. He is currently an Engineer at the National Center for Nanoscience and Technology of China. His research interests mainly focus on graphene based materials and engineering research of energy storage device.
Quan-Hong Yang was born in 1972, joined Tianjin University as a full professor of nanomaterials in 2006 and became a chair professor in 2016. His research is related to novel carbon materials, from porous carbons, tubular carbons to sheetlike graphenes with their applications in energy storage and environmental protection. See http://nanoyang.tju.edu.cn for more details.
Linjie Zhi received his PhD in 2000 at the Institute of Coal Chemistry, CAS. Since 2003 he had been working with Prof. Müllen at Max-Planck Institute for Polymer Research for two years before assuming the position of project leader there until the end of 2007. He is currently a professor at the National Center for Nanoscience and Technology of China. His research interests focus on carbon-rich materials and their application in energy-related areas.
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WS2 nanoplates embedded in graphitic carbon nanotubes with excellent electrochemical performance for lithium and sodium storage
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Kong, D., Qiu, X., Wang, B. et al. WS2 nanoplates embedded in graphitic carbon nanotubes with excellent electrochemical performance for lithium and sodium storage. Sci. China Mater. 61, 671–678 (2018). https://doi.org/10.1007/s40843-017-9185-3
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DOI: https://doi.org/10.1007/s40843-017-9185-3